After removing all nvidia-related packages from a computer running 18.04, I tried
$ sudo ubuntu-drivers autoinstall
and everything installed with no errors.

Looking at the error:

dpkg: error processing archive /tmp/apt-dpkg-install-x8YVfC/03-libnvidia-compute-390_390.48-0ubuntu2_i386.deb (--unpack):
trying to overwrite shared '/etc/OpenCL/vendors/nvidia.icd', which is different from other instances of package libnvidia-compute-390:i386

Hello,
The GUI (graphicc user interface)!dose not start If i have no internet connection (offline )
An other personé (novice on ubuntu ) has upgrade Ubuntu 16.04 to Ubuntu 18.04 Have the same probkeme
The internet must connect at start (Ethernet or WiFi)
Same problem whith the live dvd ?
Why this internet connection deprndence
Why the GUI coud’nt Start ofline
Could you confirme this and help me to fix this issue
Thanks for your supporters
Best regards